Supra-Pan-African unconformity between core and cover series of the Menderes Massif/Turkey and its geological implications |
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| Authors: | O Candan OE Koralay C Akal O Kaya R Oberhänsli OÖ Dora N Konak F Chen |
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| Institution: | 1. Department of Geochemistry and Petrology, Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;2. IGMR, ETH-Zurich, Switzerland;3. Department of Mineralogy, University of Geneva, CH-1205 Geneva, Switzerland;4. Department of Geology, Paleontology and Fossil Fuels, Sofia University “St. Kliment Ohridski”, 1504 Sofia, Bulgaria;1. General Directorate of Mineral Research and Exploration (MTA), Department of Marine and Environmental Research, 06800 Çankaya, Ankara, Turkey;2. Earth Research Institute, University of California, Santa Barbara, CA, USA;3. Eurasia Institute of Earth Sciences Department of Geology, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey;1. Department of Geological Engineering, Gümü?hane University, TR-29000 Gümü?hane, Turkey;2. Department of Geological Engineering, Karadeniz Technical University, TR-61080 Trabzon, Turkey;1. Dokuz Eylül University, Dept. of Geological Engineering, TR-35160 ?zmir, Turkey;2. ?stanbul Technical University, Dept. of Geological Engineering, TR-34469 ?stanbul, Turkey;3. School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, European Way, Southampton SO14 3ZH, UK;4. Institute for Geosciences, Johannes Gutenberg University, 55099 Mainz, Germany;5. Faculty of Mining and Geology University, Belgrade, Serbia;6. Karadeniz Technical University, Dept. of Geological Engineering, TR-61080 Trabzon, Turkey |
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| Abstract: | Well-preserved primary contact relationships between a Late Proterozoic metasedimentary and the metagranitic core and Palaeozoic cover series of the Menderes Massif have been recognized in the eastern part of the Çine submassif on a regional-scale. Metaconglomerates occur as laterally discontinuous channel-fill bodies close the base of the metaquartzarenite directly above the basement. The pebbles in the metaconglomerates consist mainly of different types of tourmaline-rich leucocratic granitoids, tourmalinite and schist in a sandy matrix. Petrographic features, geochemical compositions and zircon radiometric ages (549.6 ± 3.7–552.3 ± 3.1 Ma) of the diagnostic clasts of the metaconglomerates (e.g. leucocratic granitoids and tourmalinites) show excellent agreement with their in situ equivalents (549.0 ± 5.4 Ma) occurring in the Pan-African basement as stocks and veins.The correlation between clasts in the metaconglomerates and granitoids of the basement suggests that the primary contact between the basement and cover series is a regional unconformity (supra-Pan-African Unconformity) representing deep erosion of the Pan-African basement followed by the deposition of the cover series. Hence the usage of ‘core–cover’ terminology in the Menderes Massif is valid. Consequently, these new data preclude the views that the granitic precursors of the leucocratic orthogneisses are Tertiary intrusions. |
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